JOKE: What is a pessimist?

The teacher asked Little Suzi, "What is a pessimist?"

Suzi responded, "That's the thing a man wears when he doesn't want to make babies."

The appalled teacher said, "Certainly not!" and continued on with her lesson.

"Now, class: what is an optimist?"

Little Johnny's hand flew up. "That's a guy who doesn't use a pessimist!"